端柱面组合密封气膜稳态特性数值仿真分析

针对航空发动机等高速流体机械中流体动密封部位的工况特点，提出一种新型的端柱面组合气膜密封形式.根据气膜密封的结构特点，建立了端柱面螺旋槽组合式密封气膜的数学分析模型.采用CFD分析软件Fluent对气膜三维流场模型以湍流流动形式进行数值模拟计算.研究了密封气膜几何结构参数变化对密封稳态特性（端面承载力F_d 、柱面承载力F_c 、泄漏量Q、摩擦转矩M）的影响.几何结构参数包括端面平均膜厚、端面槽深比、柱面平均膜厚、柱面偏心率、柱面槽深比、柱面槽宽比. 

Numerical simulation analysis of steady-state properties of gas face and cylinder film seal

Aimed at the special condition of fluidic dynamic seals of high speed fluid machineries such as the aero-engine, a new type of sealing form, gas face and cylinder film seal was proposed. According to the structure characteristics of the gas film seal, the mathematical analysis model of the gas face and cylinder film seal was built. Then the model of gas film's three-dimensional flow field was numerically calculated by Fluent in the form of turbulent flow. The influence of sealing geometry structure parameters on the stability performances of the seal such as face opening force F_d, cylindrical opening force F_c, leakage Q, and friction torque M was studied. The geometry structure parameters include gas face film thickness, face groove depth ratio, cylindrical film thickness, cylindrical eccentricity, cylindrical groove depth ratio, and cylindrical groove width ratio.